Drawing — Pick a material from the toolbar, then click and drag on the canvas. The Brush slider sets your pour size. Solids paint dense; powders and liquids sprinkle.
The spout — That little hopper at the top of the screen endlessly pours material. Drag it left or right to position it, choose what it pours with the Spout dropdown, and toggle it with the Pouring button.
Torch — One torch per click. It falls until it lands on a surface and burns forever — unless water touches it.
Grenade — Press and hold to set the fuse: every second held adds a second to the timer, up to 30. Release to drop it. Watch the countdown and the blinking light.
Nukes — Click a target and a shell arcs in from off-screen, Tank Wars style. The 20kt leaves a huge crater; the 5Mt erases most of the map. Nothing survives the blast — not even concrete.
Disintegrator — Arcs in the same way, but instead of exploding it bores branching, lightning-like tunnels all the way through whatever it hits.
Shortcuts — Space pauses, C clears, E erases, F goes fullscreen.